Bis­(nitrato-κ²O,O′)(1,4,7,10,13-pentaoxa­cyclo­penta­decane)­calcium(II)

The crystal structure of the title compound, [Ca(NO₃)₂(C₁₀H₂₀O₅)], at 120 K contains discrete mol­ecules with nine-coordinate Ca atoms. There are two mol­ecules in the asymmetric unit, related by a pseudo-inversion centre. The crown bonds through five O atoms [Ca—O = 2.464 (2)–2.567 (2) Å] and the nitrates are bidentate [Ca—O = 2.444 (2)–2.588 (2) Å]. The structure is a polymorph of a previously reported room-temperature form.